/* ===== CSS变量 ===== */
:root {
  --primary: #1a56db;
  --primary-dark: #1340b0;
  --primary-light: #e8f0fe;
  --accent: #f59e0b;
  --text-primary: #1a1a2e;
  --text-body: #374151;
  --text-muted: #6b7280;
  --bg-white: #ffffff;
  --bg-light: #f8fafc;
  --bg-blue: #1a3a6b;
  --border: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 14px;
  --transition: 0.25s ease;
  /* Google Fonts已本地化替换为系统字体，消除境外资源加载阻塞 */
  --font-calligraphy: 'Songti SC', 'STSong', 'SimSun', serif;
  --font-body: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
}

/* ===== 全局重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  color: var(--text-body);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 80px 0; }
.bg-white { background: var(--bg-white); }
.bg-light { background: var(--bg-light); }
.bg-blue { background: var(--bg-blue); }

/* ===== 面包屑导航 ===== */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  background: var(--bg-light);
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.breadcrumb-list li::after {
  content: '›';
  margin-left: 8px;
  color: var(--text-muted);
}
.breadcrumb-list li:last-child::after { content: ''; }
.breadcrumb-list li:last-child { color: var(--text-primary); font-weight: 500; }
.breadcrumb-list a { color: var(--primary); font-weight: 500; transition: color var(--transition); }
.breadcrumb-list a:hover { color: var(--primary-dark); }

/* ===== 章节标题 ===== */
.sec-head { text-align: center; margin-bottom: 52px; }
.sec-head.light .sec-tag,
.sec-head.light .sec-title,
.sec-head.light .sec-sub { color: rgba(255,255,255,0.9); }
.sec-head.light .sec-tag { background: rgba(255,255,255,0.15); color: white; }
.sec-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.sec-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 12px;
}
.sec-sub {
  font-size: 1rem;
  color: var(--text-muted);
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 13px 32px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26,86,219,0.35);
}
.btn-ghost {
  display: inline-block;
  border: 2px solid rgba(255,255,255,0.7);
  color: white;
  padding: 11px 28px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.15);
  border-color: white;
}

/* ===== 顶部导航 ===== */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: #1a3a6b;
  box-shadow: 0 2px 12px rgba(0,0,0,0.25);
  transition: background var(--transition), box-shadow var(--transition);
}
#header.scrolled {
  background: #1a3a6b;
  box-shadow: 0 2px 12px rgba(0,0,0,0.25);
}
#header.always-white {
  background: #1a3a6b;
  box-shadow: 0 2px 12px rgba(0,0,0,0.25);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.logo-img { height: 46px; width: auto; object-fit: contain; }
.logo-text-block { display: flex; flex-direction: column; }
.logo-cn {
  font-family: var(--font-calligraphy);
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  line-height: 1.1;
  letter-spacing: 0.05em;
  transition: color var(--transition);
}
.logo-sub-cn {
  font-size: 0.62rem;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.12em;
  transition: color var(--transition);
}
#header.scrolled .logo-cn,
#header.always-white .logo-cn { color: white; }
#header.scrolled .logo-sub-cn,
#header.always-white .logo-sub-cn { color: rgba(255,255,255,0.7); }

/* 导航链接 */
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-list > li { position: relative; }
.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active { background: rgba(255,255,255,0.15); color: white; }
/* 统一所有头部状态下的导航文字颜色（头部背景始终为深蓝色） */
#header.scrolled .nav-link,
#header.always-white .nav-link,
#header .nav-link { color: rgba(255,255,255,0.9); }
#header.scrolled .nav-link:hover,
#header.scrolled .nav-link.active,
#header.always-white .nav-link:hover,
#header.always-white .nav-link.active,
#header .nav-link:hover,
#header .nav-link.active { background: rgba(255,255,255,0.15); color: white; }

.arrow-down { font-style: normal; font-size: 0.75em; opacity: 0.8; }

/* 二级菜单 */
.has-sub { position: relative; }
.sub-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  min-width: 220px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateX(-50%) translateY(-8px);
  transition: all var(--transition);
  border: 1px solid var(--border);
  z-index: 100;
  max-height: 480px;
  overflow-y: auto;
}
.has-sub:hover .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.sub-menu a {
  display: block;
  padding: 9px 20px;
  font-size: 0.88rem;
  color: var(--text-body);
  transition: all var(--transition);
  white-space: nowrap;
}
.sub-menu a:hover {
  background: var(--primary-light);
  color: var(--primary);
  padding-left: 26px;
}

/* 汉堡按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: white;
  border-radius: 2px;
  transition: all var(--transition);
}
#header.scrolled .hamburger span,
#header.always-white .hamburger span { background: var(--text-primary); }

/* 手机菜单 */
.mobile-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1100;
  opacity: 0; visibility: hidden;
  transition: all var(--transition);
}
.mobile-overlay.open { opacity: 1; visibility: visible; }
.mobile-nav {
  position: fixed;
  top: 0; right: 0;
  width: 280px; height: 100vh;
  background: white;
  z-index: 1200;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
  padding: 20px 0;
  -webkit-overflow-scrolling: touch;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-close {
  position: absolute; top: 16px; right: 16px;
  font-size: 1.2rem; color: var(--text-muted);
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
}
.mobile-close:hover { background: var(--bg-light); }
.mobile-nav-list { padding: 48px 0 20px; }
.mobile-nav-list > li > a,
.mobile-nav-list > li > span {
  display: block;
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}
.mob-has-sub > ul {
  display: none;
  background: var(--bg-light);
}
.mob-has-sub > ul a {
  display: block;
  padding: 10px 36px;
  font-size: 0.85rem;
  color: var(--text-body);
  border-bottom: 1px solid var(--border);
}
.mob-has-sub > ul a:hover { color: var(--primary); }
.mob-has-sub.open > ul { display: block; }

/* ===== HERO ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, #0d2251 0%, #1a56db 50%, #0d4f8c 100%);
}
.hero-bg::after {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 60L60 0M-10 10L10-10M50 70L70 50' stroke='rgba(255,255,255,0.04)' stroke-width='1'/%3E%3C/svg%3E");
}
.hero-content {
  position: relative; z-index: 1;
  padding: 140px 24px 60px;
  text-align: center;
}
.hero-tag {
  display: inline-block;
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem;
  padding: 6px 18px;
  border-radius: 20px;
  margin-bottom: 24px;
  border: 1px solid rgba(255,255,255,0.2);
}
.hero-h1 {
  font-size: 3rem;
  font-weight: 700;
  color: white;
  line-height: 1.25;
  margin-bottom: 20px;
}
.hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 36px;
  line-height: 1.9;
}
.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-stats {
  position: relative; z-index: 1;
  background: rgba(0,0,0,0.25);
  padding: 0;
  margin-top: auto;
  backdrop-filter: blur(6px);
}
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat-item {
  padding: 24px 20px;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,0.1);
}
.stat-item:last-child { border-right: none; }
.stat-item strong {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  color: white;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-item span {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
}

/* ===== 关于我们 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-company-card {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.company-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.company-badge.inland { background: #dbeafe; color: #1e40af; }
.company-badge.hk { background: #fef3c7; color: #92400e; }
.about-company-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.about-company-card p { font-size: 0.9rem; color: var(--text-body); margin-bottom: 10px; }
.about-points { font-size: 0.88rem; color: var(--text-muted); }
.about-points li { padding: 3px 0; }

.adv-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.adv-list { display: flex; flex-direction: column; gap: 16px; }
.adv-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid var(--border);
}
.adv-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 2px; }
.adv-item strong { display: block; font-size: 0.95rem; color: var(--text-primary); margin-bottom: 4px; }
.adv-item p { font-size: 0.88rem; color: var(--text-muted); }

/* ===== 核心业务 ===== */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.biz-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all var(--transition);
}
.biz-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.biz-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1;
  margin-bottom: 12px;
}
.biz-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.biz-card p { font-size: 0.88rem; color: var(--text-muted); }

/* ===== 工程图集 ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.gal-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}
.gal-item img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.gal-item:hover img { transform: scale(1.05); }
.gal-item span {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: white;
  font-size: 0.8rem;
  padding: 20px 10px 10px;
  text-align: center;
}

/* ===== 合作优势 ===== */
.adv-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.adv-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  transition: all var(--transition);
}
.adv-card:hover {
  background: rgba(255,255,255,0.14);
  transform: translateY(-3px);
}
.adv-card-icon { font-size: 2rem; margin-bottom: 12px; }
.adv-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: white;
  margin-bottom: 10px;
}
.adv-card p { font-size: 0.88rem; color: rgba(255,255,255,0.75); }

/* ===== 客户反馈 ===== */
.feedback-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.feedback-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  border-left: 4px solid var(--primary);
}
.feedback-quote {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 16px;
  font-style: italic;
}
.feedback-from { font-size: 0.82rem; color: var(--text-muted); font-weight: 500; }

/* ===== CTA横幅 ===== */
.cta-bar {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  padding: 40px 0;
}
.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-inner h2 { font-size: 1.3rem; font-weight: 700; color: white; margin-bottom: 6px; }
.cta-inner p { font-size: 0.9rem; color: rgba(255,255,255,0.8); }
.cta-bar .btn-primary {
  background: white;
  color: var(--primary);
  white-space: nowrap;
  flex-shrink: 0;
}
.cta-bar .btn-primary:hover {
  background: #f0f4ff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

/* ===== 产品服务 ===== */
.prod-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
  justify-content: center;
}
.prod-nav-btn {
  display: inline-block;
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-body);
  background: white;
  transition: all var(--transition);
}
.prod-nav-btn:hover,
.prod-nav-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.prod-block {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 80px;
}
.prod-block.alt { background: #fafbff; }
.prod-inner {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 0;
}
.prod-img-wrap {
  overflow: hidden;
  position: relative;
}
.prod-img-wrap img {
  width: 100%;
  height: 100%;
  min-height: 280px;
  object-fit: cover;
}
.prod-detail { padding: 32px; }
.prod-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.prod-detail h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.prod-intro {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 20px;
}
.prod-tags-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.prod-tag-block {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 14px;
}
.prod-tag-block h4 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.prod-tag-block p { font-size: 0.85rem; color: var(--text-muted); }
.prod-tag-block ul { font-size: 0.85rem; color: var(--text-muted); padding-left: 14px; list-style: disc; }
.prod-tag-block ul li { margin-bottom: 4px; }

/* ===== 项目案例 ===== */
.case-tab-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.case-tab {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 500;
  border: 1px solid var(--border);
  color: var(--text-body);
  background: white;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.case-tab:hover { border-color: var(--primary); color: var(--primary); }
.case-tab.active { background: var(--primary); color: white; border-color: var(--primary); }
.cases-container { display: flex; flex-direction: column; gap: 48px; }
.case-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 80px;
}
.case-imgs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-light);
  padding: 4px;
}
.case-imgs img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  border-radius: 6px;
  display: block;
}
.case-content { padding: 32px; }
.case-cat-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.case-cat-tag.commercial { background: #dbeafe; color: #1e40af; }
.case-cat-tag.clean { background: #d1fae5; color: #065f46; }
.case-cat-tag.cold { background: #e0f2fe; color: #075985; }
.case-cat-tag.industry { background: #fef3c7; color: #92400e; }
.case-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.case-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.case-item.full { grid-column: 1 / -1; }
.case-item strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 6px;
}
.case-item p { font-size: 0.9rem; color: var(--text-body); line-height: 1.7; }
.case-cta {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.case-cta a { color: var(--primary); font-weight: 600; }
.case-cta a:hover { text-decoration: underline; }

/* ===== 战略合作 ===== */
.partner-section { margin-bottom: 56px; }
.partner-sec-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
}
.partner-sec-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.brand-logo-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.brand-logo-item {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 12px;
  text-align: center;
  transition: all var(--transition);
}
.brand-logo-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.brand-logo-item img {
  height: 48px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  margin: 0 auto 8px;
}
.brand-logo-item span { font-size: 0.78rem; color: var(--text-muted); }

.client-logo-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 12px;
}
.client-logo-item {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 72px;
  transition: all var(--transition);
}
.client-logo-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}
.client-logo-item img {
  height: 44px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

.model-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.model-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
}
.model-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.model-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-light);
  line-height: 1;
  margin-bottom: 12px;
}
.model-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.model-card p { font-size: 0.85rem; color: var(--text-muted); }

.bulk-list { display: flex; flex-direction: column; gap: 16px; }
.bulk-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: white;
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
}
.bulk-icon { font-size: 1.5rem; flex-shrink: 0; }
.bulk-item strong { display: block; font-size: 0.95rem; color: var(--text-primary); margin-bottom: 4px; }
.bulk-item p { font-size: 0.88rem; color: var(--text-muted); }

.gov-intro {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.gov-intro p { font-size: 0.95rem; color: var(--text-body); margin-bottom: 16px; }
.gov-list { padding-left: 16px; list-style: none; }
.gov-list li {
  font-size: 0.9rem;
  color: var(--text-body);
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.7;
}
.gov-list li:last-child { border-bottom: none; }
.gov-list li strong { color: var(--text-primary); }

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}
.contact-card {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 24px;
}
.contact-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.contact-items { display: flex; flex-direction: column; gap: 16px; }
.contact-item { display: flex; gap: 12px; align-items: flex-start; }
.ci-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }
.contact-item strong { display: block; font-size: 0.85rem; font-weight: 700; color: var(--text-primary); margin-bottom: 3px; }
.contact-item p { font-size: 0.9rem; color: var(--text-body); }
.contact-item a { color: var(--primary); font-weight: 500; }
.contact-item a:hover { text-decoration: underline; }

.survey-card {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.survey-card h3 { font-size: 1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 16px; }
.survey-steps { display: flex; flex-direction: column; gap: 12px; margin-bottom: 16px; }
.survey-step { display: flex; gap: 12px; align-items: flex-start; }
.step-num {
  width: 26px; height: 26px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.survey-step p { font-size: 0.9rem; color: var(--text-body); padding-top: 2px; }
.survey-note { font-size: 0.85rem; color: var(--primary); font-weight: 500; }

/* 表单 */
.contact-form-wrap {
  background: var(--bg-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.form-title { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.form-sub { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 24px; }
.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  color: var(--text-body);
  background: white;
  font-family: var(--font-body);
  transition: border-color var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,0.1); }
.form-group textarea { resize: vertical; }
.btn-submit { width: 100%; padding: 14px; font-size: 1rem; grid-column: 1 / -1; }

/* 留言提交后的轻量提示（不遮挡页面，3秒自动消失） */
.wxb-toast {
  position: fixed; left: 50%; bottom: 32px;
  transform: translateX(-50%) translateY(20px);
  max-width: 90vw; background: rgba(21, 128, 61, 0.96); color: #fff;
  padding: 12px 20px; border-radius: 999px; font-size: 0.9rem; line-height: 1.4;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18); z-index: 9999; text-align: center;
  opacity: 0; pointer-events: none; transition: opacity .3s, transform .3s;
}
.wxb-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 展厅 */
.showroom-section { margin-top: 40px; }
.showroom-imgs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 20px;
}
.showroom-img-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.showroom-img-item img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
}
.showroom-img-item span {
  display: block;
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: white;
  text-align: center;
}

/* ===== 资讯分类筛选 ===== */
.news-cat-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.cat-filter-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 500;
  border: 1px solid var(--border);
  color: var(--text-body);
  background: white;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.cat-filter-btn:hover { border-color: var(--primary); color: var(--primary); }
.cat-filter-btn.active { background: var(--primary); color: white; border-color: var(--primary); }

/* 分类标签颜色 */
.news-card-tag.tag-ac { background: #dbeafe; color: #1a56db; }
.news-card-tag.tag-clean { background: #d1fae5; color: #065f46; }
.news-card-tag.tag-cold { background: #e0f2fe; color: #075985; }
.news-card-tag.tag-vent { background: #fef3c7; color: #92400e; }

/* ===== 资讯新闻板块 ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.news-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}
.news-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.news-card-img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  background: var(--bg-light);
}
.news-card-body { padding: 20px; }
.news-card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 4px;
  background: var(--primary-light);
  color: var(--primary);
  margin-bottom: 10px;
}
.news-card-body h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.5;
}
.news-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 10px;
}
.news-card-seo {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
  padding: 10px 12px;
  background: var(--bg-light);
  border-radius: 6px;
  margin-bottom: 12px;
  border-left: 3px solid var(--primary);
}
/* 资讯页底部单条服务说明备注（整站仅出现一次，不在每篇文章重复） */
.news-seo-note {
  padding: 16px 20px;
  background: var(--bg-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 8px 8px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.8;
}
.news-card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}
.news-card-meta a { color: var(--primary); font-weight: 500; }

/* ===== Footer ===== */
#footer { background: #0d1627; color: rgba(255,255,255,0.8); padding: 60px 0 0; }
.footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-logo-row { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-logo-img { height: 40px; width: auto; object-fit: contain; }
.footer-logo-name {
  font-family: var(--font-calligraphy);
  font-size: 1.3rem;
  font-weight: 700;
  color: white;
  letter-spacing: 0.04em;
}
.footer-logo-en { font-size: 0.62rem; color: rgba(255,255,255,0.5); letter-spacing: 0.1em; }
.footer-slogan { font-size: 0.88rem; color: rgba(255,255,255,0.6); margin-bottom: 12px; line-height: 1.6; }
.footer-contact-line { font-size: 0.88rem; color: rgba(255,255,255,0.7); margin-bottom: 6px; }
.footer-contact-line a { color: rgba(255,255,255,0.8); }
.footer-contact-line a:hover { color: white; }
.footer-addr { font-size: 0.82rem; color: rgba(255,255,255,0.5); margin-top: 8px; }
.footer-col h3 {
  font-size: 0.88rem;
  font-weight: 700;
  color: white;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.footer-col ul li {
  padding: 5px 0;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.5;
}
.footer-col ul li a { color: rgba(255,255,255,0.6); transition: color var(--transition); }
.footer-col ul li a:hover { color: white; }
.footer-keywords { margin-top: 16px; }
.footer-keywords p { font-size: 0.8rem; color: rgba(255,255,255,0.4); line-height: 1.8; }
.footer-bottom {
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.35); }
.footer-bottom a { color: rgba(255,255,255,0.35); }
.footer-bottom a:hover { color: rgba(255,255,255,0.6); }

/* ===== 悬浮按钮 ===== */
.float-btns {
  position: fixed;
  right: 20px;
  bottom: 30px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 900;
}
.float-btn {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  cursor: pointer;
}
.float-btn.phone { background: #16a34a; color: white; }
.float-btn.wechat { background: #0891b2; color: white; }
.float-btn.top {
  background: white;
  color: var(--text-body);
  border: 1px solid var(--border);
  font-size: 1rem;
  opacity: 0;
  visibility: hidden;
}
.float-btn.top.show { opacity: 1; visibility: visible; }
.float-btn:hover { transform: scale(1.1); box-shadow: var(--shadow-lg); }

/* ===== 页面内导航页头（非首页用） ===== */
.page-header {
  background: linear-gradient(135deg, #0d2251 0%, #1a56db 50%, #0d4f8c 100%);
  padding: 120px 0 60px;
  text-align: center;
  position: relative;
}
.page-header::after {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 60L60 0M-10 10L10-10M50 70L70 50' stroke='rgba(255,255,255,0.04)' stroke-width='1'/%3E%3C/svg%3E");
}
.page-header .container { position: relative; z-index: 1; }
.page-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: white;
  margin-bottom: 16px;
}
.page-header p {
  font-size: 1rem;
  color: rgba(255,255,255,0.8);
}

/* ===== 响应式适配 ===== */
@media (max-width: 1100px) {
  .brand-logo-grid { grid-template-columns: repeat(4, 1fr); }
  .client-logo-grid { grid-template-columns: repeat(5, 1fr); }
  .footer-inner { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 32px; }
  .prod-inner { grid-template-columns: 320px 1fr; }
}

@media (max-width: 900px) {
  .section { padding: 64px 0; }
  .nav-list { display: none; }
  .hamburger { display: flex; }
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .biz-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-cards { grid-template-columns: repeat(2, 1fr); }
  .feedback-grid { grid-template-columns: 1fr; }
  .prod-inner { grid-template-columns: 1fr; }
  .prod-img-wrap img { min-height: 220px; max-height: 260px; }
  .prod-tags-row { grid-template-columns: 1fr; }
  .model-cards { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2) { border-right: none; }
  .stat-item { border-bottom: 1px solid rgba(255,255,255,0.1); }
  .stat-item:last-child, .stat-item:nth-last-child(2) { border-bottom: none; }
  .hero-h1 { font-size: 2.2rem; }
  .hero-content { padding: 120px 24px 50px; }
  .page-header h1 { font-size: 1.8rem; }
  .case-content { padding: 24px; }
  .prod-detail { padding: 24px; }
  .news-grid { grid-template-columns: 1fr 1fr; }
  .container { padding: 0 20px; }
}

@media (max-width: 640px) {
  .section { padding: 48px 0; }
  .biz-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .adv-cards { grid-template-columns: 1fr; }
  .brand-logo-grid { grid-template-columns: repeat(3, 1fr); }
  .client-logo-grid { grid-template-columns: repeat(3, 1fr); }
  .model-cards { grid-template-columns: 1fr; }
  .case-imgs { grid-template-columns: 1fr; gap: 6px; padding: 6px; }
  .case-imgs img { aspect-ratio: 16/9; }
  .case-grid { grid-template-columns: 1fr; }
  .contact-form { grid-template-columns: 1fr; }
  .showroom-imgs { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 0; }
  .hero-h1 { font-size: 1.7rem; }
  .hero-desc { font-size: 1rem; }
  .sec-title { font-size: 1.5rem; }
  .sec-head { margin-bottom: 36px; }
  .cta-inner { flex-direction: column; text-align: center; }
  .cta-bar { padding: 32px 0; }
  .page-header { padding: 100px 0 40px; }
  .page-header h1 { font-size: 1.5rem; }
  .news-grid { grid-template-columns: 1fr; }
  .cat-filter-btn { padding: 6px 14px; font-size: 0.82rem; }
  .case-content { padding: 20px; }
  .prod-detail { padding: 20px; }
  .about-company-card { padding: 20px; }
  .contact-form-wrap { padding: 24px; }
  .contact-card { padding: 20px; }
  .survey-card { padding: 20px; }
  .float-btns { right: 16px; bottom: 20px; }
  .float-btn { width: 44px; height: 44px; font-size: 1.1rem; }
  .container { padding: 0 16px; }
  .hero-content { padding: 110px 16px 40px; }
  .stat-item { padding: 16px 12px; }
  .stat-item strong { font-size: 1.6rem; }
  .stat-item span { font-size: 0.75rem; }
  .partner-section { margin-bottom: 40px; }
  .cases-container { gap: 32px; }
  .case-tab { padding: 6px 14px; font-size: 0.82rem; }
  .prod-nav { gap: 6px; }
  .prod-nav-btn { padding: 6px 12px; font-size: 0.8rem; }
}

@media (max-width: 380px) {
  .hero-h1 { font-size: 1.4rem; }
  .sec-title { font-size: 1.3rem; }
  .page-header h1 { font-size: 1.3rem; }
  .brand-logo-grid { grid-template-columns: repeat(2, 1fr); }
  .client-logo-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: 1fr; }
}

/* ===== 页脚折叠（手机 + PC 通用，点击标题切换） ===== */
.fcol { position: relative; }
.fcol-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  padding: 0 0 16px;
  margin: 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
}
.fcol-arrow {
  display: inline-block;
  width: 0; height: 0;
  margin-left: 8px;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid rgba(255,255,255,0.6);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.fcol.open .fcol-arrow { transform: rotate(180deg); }
.fcol-body {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.35s ease;
}
.fcol.open .fcol-body { max-height: 1400px; }
.fcol-body a {
  display: block;
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  line-height: 1.6;
  padding: 4px 0;
  transition: color 0.2s;
}
.fcol-body a:hover { color: #fff; }

/* ===== Footer 四栏新布局 ===== */
#footer {
  background: #0f1a2e;
  color: rgba(255,255,255,0.82);
  padding: 0;
  margin-top: 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 40px;
  padding: 60px 0 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-col-brand {
  max-width: 320px;
}

.footer-col h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: white;
  margin-bottom: 18px;
  line-height: 1.5;
}

.footer-col a {
  display: block;
  color: rgba(255,255,255,0.7);
  font-size: 0.9rem;
  line-height: 1.5;
  padding: 4px 0;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: white;
}

.footer-logo-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.footer-logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.footer-logo-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: white;
}

.footer-logo-en {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.05em;
}

.footer-slogan {
  font-size: 0.92rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 6px;
}

.footer-desc {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.6;
}

.footer-col-contact p {
  font-size: 0.88rem;
  line-height: 1.5;
  padding: 3px 0;
  color: rgba(255,255,255,0.7);
}

.footer-col-contact a {
  display: inline;
  color: rgba(255,255,255,0.85);
}

.footer-col-contact a:hover {
  color: white;
}

.footer-addr {
  margin-top: 8px;
}

/* 底部通栏版权 */
.footer-copyright {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 18px 0;
  text-align: center;
}

.footer-copyright p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}

.footer-copyright a {
  color: rgba(255,255,255,0.6);
  display: inline;
}

.footer-copyright a:hover {
  color: white;
}

/* 手机端：单列布局 */
@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 32px 0 20px;
  }
  .footer-col-brand {
    max-width: 100%;
    padding-bottom: 8px;
  }
  .fcol {
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .fcol-head {
    padding: 16px 0;
  }
  .fcol-body {
    padding-bottom: 8px;
  }
  .footer-col-contact {
    padding-top: 16px;
  }
  .footer-copyright p {
    font-size: 0.75rem;
  }
}